diff --git a/mainwindow.cpp b/mainwindow.cpp
index 97a12c7..c5305b7 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -94,18 +94,20 @@ void MainWindow::shutdown()
 void MainWindow::updateTime()
 {
     if (mTimeLeft == 0) {
-        ui->lbl_timer->setText("00:00");
+        ui->lbl_timer->setText("0:00:00");
         shutdown();
         mTimer.stop();
         return;
     }
 
-    QString m = QString::number(mTimeLeft / 60);
+    QString h = QString::number(mTimeLeft / 3600);
+    QString m = QString::number((mTimeLeft / 60) % 60);
     QString s = QString::number(mTimeLeft % 60);
 
     if (s.length() == 1) s = "0" + s;
+    if (m.length() == 1) m = "0" + m;
 
-    ui->lbl_timer->setText(m + ":" + s);
+    ui->lbl_timer->setText(h + ":" + m + ":" + s);
     mTimeLeft--;
 }
 
@@ -122,7 +124,7 @@ void MainWindow::timerToggled() {
     } else {
         mTimeLeft = -1;
         mTimer.stop();
-        ui->lbl_timer->setText("-- : --");
+        ui->lbl_timer->setText("--:--:--");
         ui->stackedWidget->setCurrentIndex(0);
     }
 }
diff --git a/mainwindow.ui b/mainwindow.ui
index ee9a126..c0a75c8 100644
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>279</width>
+    <width>281</width>
     <height>118</height>
    </rect>
   </property>
@@ -145,7 +145,7 @@
            <enum>QFrame::Sunken</enum>
           </property>
           <property name="text">
-           <string>-- : --</string>
+           <string>--:--:--</string>
           </property>
           <property name="alignment">
            <set>Qt::AlignCenter</set>